What is the ruling if a player competes in the first 18 holes of a 72 hole stroke play event and hits a few shots for a commercial prior to his round?

In the context of a 72-hole stroke play event, the rules of golf dictate strict adherence to when and how players may practice. If a player hits a few shots for a commercial prior to their round, even if done before their first tee time, this behavior is not permitted once the player begins their round.

Once a player has started their round, engaging in additional practice — which includes hitting shots or practicing putting — is a violation of the rules. Because the player has already commenced their first round, these actions warrant disqualification from the event. Disqualification is the appropriate ruling because it reflects the integrity of the competition and reinforces the importance of following regulations during play.

In contrast, other options such as receiving a warning or continuing without penalty would suggest leniency that is not aligned with the rules established to maintain fairness in competition. Thus, disqualification for practicing during the round serves to uphold the standards expected in professional play.